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-5+12=-3x
We move all terms to the left:
-5+12-(-3x)=0
We add all the numbers together, and all the variables
-(-3x)+7=0
We get rid of parentheses
3x+7=0
We move all terms containing x to the left, all other terms to the right
3x=-7
x=-7/3
x=-2+1/3
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